Question

Fill in the blank :
The impression of an image lasts on the retina for ............. of a second

Answer 1

An image stays on the retina for about $\frac{1}{16}$ of a second. This feature is called persistence of vision . Due to this, when many still images are shown in a sequence; they give the illusion of moving images. Movies and animation are made by exploiting this property of the human eye.